Feed device for grinding-machines for ball-bearings.



0. A. HIRTH.

FJ'ED DEVICE FOR GRINDING MACHINES FOR BALL BEARINGS.

APPLICATION FILED 0013.19, 1911.

Patented Mar. 4, 1913 Imam AWE/V5115- OFFICE.

CARL ALBERT BIRTH, OF CANNSTAT'I NEAR S'IUTTGART. GERMANY.

DEVICE FOR GRINDING-MACHINES FGR BALL-BEARINGS.

Specification of Letters Patent.

Application filed October 19, 1911. .Serial No. 655,624.

To all 21 [mm it may concern Be it known that I, CARL ALB RT Hm'rri, acitizen of the German Empire, and residing 'in Cannstatt, nearStuttgart, in the Kingdom ot Wurttemberg, in the Empire of Germany, haveinvented certain new and useful Improvements in Feed Devices forGrinding-Machines for Ball-Bearings, of which the following isaspecification.

In the grinding of balls for ball bearings by means of ball grindingmachines having a number of grinding rills, or grooves, an increase inefiiciency is obtained by feeding the balls to be ground at. a velocitycorresponding to that of the grinding disk or surface, instead of at asmaller vclocit as used in the past. I

The invention relates to feed means forball grinding machines, and hasfor its object to provide means whereby the balls to be ground are fedat a high velocity to the grinding machines, and also to prevent oneball being thrust against the ot er and thereby impair the trueness ofthe same.

For this purpose my invention consists of improved means for feedingballs to ball grinding machines, comprising an injector n the path ofthe balls to be fed, and forcing by the injector act-ion each ballseparately against and toward the grinding disks, the fluid, as oil,gas, or air, used for the injector action, serving to form a layerbetween the individual balls and act as a bufi'er to the same.

In the accompanying drawing, the figure shows a vertical, axial sectionof my improved device as applied to a guiding means of well knownconstruction,

Referring to the drawing, the feed or guiding means i is supplied withballs for ball bearing purposes, and seats on a member m which isprovided with a lateral tube '11,, which is adapted to feed any suitablefluid, as air, gas, oil, etc which fluid is under pressure. The guidingmeans 2' has secured thereto and supported thereby a central guidetube'd which has its lowest end tapering, as shown by r, and this guidetube (Z serves to guide the balls from the guide I l l j fluid fedthrough the member 2'. Contiguous with the tapering end 1* of the guidetube (Z a. member a is provided which is suitably supported in positionso that its tapering bore t serves as a guide for the fluid entering thetube n. The

' tapering b'ore t, being arranged much like the well known injector,serves to give the tube a a constantly increasing velocity. The spacebetween the lowest end of the tapering bore (Z and the tapering bore fis such as to cause the rapidly moving fluid to draw from the tube 1],the balls and force them forwardly into the guide or feed tube a atsubstantially the same velocity as that of the fluid.

The arrai' gement described permits a high velocity of the balls to beobtained by a very simple and by comparatively little space Anespecially advantageous feature is that layers of fluid are provided,which act like bufl'ers or cushions and prevent an injurious contact ofthe balls.

As a serviceable fluid, not alone gasor steam may be used, but also airor oils, or any fluid acting to cause an injector action, and serve as ameans for preventing the balls from being forcibly impinged againsteachother.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A feed device for ball grinding ma chines,comprising a guide tube for the balls. a member having a tapering borefor guiding the balls, and means drawing the balls out of the guide tubeby an injector action.

Patented Mar. 4, 1 91 2,111 combination with a feed member, a

guide tube supported thereby, having atapering lower end, a memberhaving a tapering bore surrouinling the tapering end of the guide tube,a feed tube at the lower end of the tapering bore, and means for forcingfluid between the wall of the tapering bore and the tapering end of theguide tube for imparting to the balls drawn out of the guide tube andconducted to the feed tube, a velocity substantially equal to that ofthe fluid.

3. A feed-device for ball-grinding marated balls, which layer acts as acushion l0 chines, comprising means for guiding a p111- therebetween.rality of balls, and injector-acting means In testimony, that I claimthe foregoing adapted to receive said balls from said as my invention, 1have signed my name in guiding means and impart velocity thereto.presence of two subscribing witnesses.

4.. A feed-device for bal1grinding Ina- CARL ALBERT HIRTH. chines,comprising means for guiding a plu- Witnesses: rality of balls spacedapart, and meansfor' PAULINE KLAIBER, confining a layer of fluid betweenthe sepa- PAULmE'MfiLLER.

Copies-of this patent may be obtained for five centseach, by addressingthe Commissioner of Batents.

* Washington, D. C.

